The TOS episode with kahn is ok but don’t think it would make a good movie. Also by the time kahn reappears kirk is an admiral. Seems with the cast being young they want to show what important events kirk and his crew have to go through to become legends. Im no expert on kirks past but is there some great battle he took part in? Im sure fans could pick out a hundred different things that lead up to his becoming admiral. JJ abrams also messed with the timeline so who knows what the hell can happen. Maybe kahn is never a threat now? The movie was a nice way to reboot the storyline but I can understand why some fans are pissed. He opened the door to changing everything fans know about the trek world.